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烧蚀条件对飞秒激光脉冲诱导氧化锌纳米结构有重要影响。研究了800nm,150fs,250kHz的飞秒激光脉冲分别在空气中,去离子水中以及无水乙醇中垂直聚焦于氧化锌晶体表面,诱导形成不同形态的纳米结构。实验结果表明,在空气中利用飞秒激光脉冲辐照样品表面,形成了周期为180nm的纳米线;在去离子水中辐照诱导形成了由氧化锌纳米线聚集而成的“纳米球”;在无水乙醇中形成出现分叉结构的纳米线。拉曼光谱分析辐照前后晶体晶相结果表明,形成的纳米结构相对于辐照前特征峰437cm-1强度有所下降,在570cm-1处的峰值则显著增强。分析了在各种烧蚀条件下诱导形成纳米结构的演化过程以及物理机理。
Ablation conditions have an important impact on femtosecond laser induced zinc oxide nanostructures. The femtosecond laser pulses at 800nm, 150fs and 250kHz were respectively focused on the surface of zinc oxide crystal vertically in air, deionized water and absolute ethanol to induce the formation of nanostructures with different morphologies. The experimental results show that the irradiation of femtosecond laser pulses in the air on the surface of the sample results in the formation of nanowires with a period of 180 nm and the formation of “nanospheres” formed by the aggregation of ZnO nanowires in the deionized water. The formation of bifurcated nanowires in absolute ethanol. Raman spectroscopy analysis of the crystalline phase before and after irradiation showed that the intensity of the formed nanostructures relative to the pre-irradiation characteristic peak 437 cm-1 decreased slightly and the peak at 570 cm-1 was significantly enhanced. The evolution and physical mechanism of inducing nanostructures under various ablation conditions were analyzed.